i recently got a cockatiel about a week ago. i want to say he's 9 or so months old, i've named him atlas. i wanted to wait for him to adjust before i let him out of his cage for the first time, but no matter what i do he hisses if i get too close, and i'm worried that he won't get back in the cage if i let him out, so i haven't done that yet. recently, he started showing signs of wanting to leave the cage like pecking at the door. i'm not sure what to do in this situation, ideally i'd like to build some more trust between us before i let him out, but i don't want him to get depressed because i won't let him out. any advice?